A communication module is provided with a TransmitReceive element fabricated from psuedomorphic HEMT, High Electron Mobility Transistor technology. In some cases, the water heater controller may determine a rate of change of the water temperature in the water heater tank. The bearing assembly is designed such that it can be disconnected from the actuator assembly for rework without damaging or contaminating the actuator assembly or bearing assembly. The measurement unit is configured to measure information on spatial distribution of the plaque portion andor the calcification portion designated by the designation unit. At least a portion of the resonance current or the resonance electric field in at least one of the resonance modes is made discontinuous such that the first and second resonance modes are coupled.